As far as I know , all the K Kohlers have those gears, but most people take them out when rebuilding. No troubles with the drive shaft on my MF14. 3 point is an option, none on mine. Front wheel bearings went on mine, not a big problem. 2 speed rear ends are good, no trouble with mine. Ignition switch went on mine, but that is some what common with any garden tractor. Charging system needed wire end replaced on mine, mostly little things with mine over the years. Had to replace the engine, but it was bad before I got it. Noel.
What are these "grenade gears" of which you speak?